interface Radio {
    switchRadio(trigger: boolean): void;
}
interface Battery {
    checkBatteryStatus(): void;
}
interface RadioWithBattery extends Radio {
    checkBatteryStatus(): void;
}

class Car implements Radio{
    switchRadio(trigger: boolean){

    }
}

class Cellphone implements RadioWithBattery {
    switchRadio(trigger: boolean){

    }
    checkBatteryStatus(){

    }
}
